显示软键盘时后退键的Android键事件？

我试图在显示软键盘时捕获“后退”键事件.

我正在使用SDK ver 8并且只能在软键盘为HIDDEN时成功捕获后退键事件,如下所示：

@Override
public void onBackpressed() {
    // do something
    super.onBackpressed();
}

问题是系统在显示软键盘时没有调用此方法.我试图登录KeyDown / Up()方法以及上面的方法来解决这个场景中发生的事情无济于事.见下文：

@Override
public boolean onKeyUp(int keyCode,KeyEvent event) {
    //DEBUGGING
    Log.d(TAG + "KeyUP",String.valueOf(event));
}

按预期返回音量和菜单键的日志,但只有在隐藏软键盘和菜单时才会记录后退键.

是否有任何“背键”大师可以解释这种现象？

任何帮助是极大的赞赏.

解决方法

以下是捕获按键事件的方法：
1.扩展editText视图以覆盖onKeyPreIme

package com.test.test;
import android.content.Context;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.widget.EditText;

/**
 * Created by sumit.saurabh on 11/10/16.
 */
public class ChatEditText extends EditText
{
    /* Must use this constructor in order for the layout files to instantiate the class properly */
    public ChatEditText(Context context,AttributeSet attrs)
    {
        super(context,attrs);
        // Todo Auto-generated constructor stub
    }

    private KeyImeChange keyImechangelistener;

    public void setKeyImechangelistener(KeyImeChange listener)
    {
        keyImechangelistener = listener;
    }

    public interface KeyImeChange
    {
        public void onKeyIme(int keyCode,KeyEvent event);
    }

    @Override
    public boolean onKeyPreIme(int keyCode,KeyEvent event)
    {
        if (keyImechangelistener != null)
        {
            keyImechangelistener.onKeyIme(keyCode,event);
        }
        return false;
    }
}

> xml中的ChatEditText

<com.test.test.ChatEditText
        android:id = "@+id/messageEditText"
        android:layout_width = "match_parent"
        android:layout_height = "wrap_content"
        android:layout_gravity = "bottom"
        android:layout_marginLeft = "12dp"
        android:layout_marginRight = "30dp"
        android:background = "@null"
        android:hint = "Type your message"
        android:inputType = "textMultiLine"
        android:singleLine = "false"
        android:textColorHint = "#c4c0bd"
        android:textSize = "18sp"/>

>然后从任何地方附加一个监听器：

private ChatEditText messageEditText;
messageEditText =
   (ChatEditText) findViewById(R.id.messageEditText);

messageEditText.setKeyImechangelistener(new ChatEditText.KeyImeChange(){
    @Override
    public void onKeyIme(int keyCode,KeyEvent event)
    {
        if (KeyEvent.KEYCODE_BACK == event.getKeyCode())
        {
            // do something
        }
    }});